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The .277 Fury or 6.8×51mm Common Cartridge [4] [5] (designated as the .277 SIG Fury by SAAMI) [1] is a centerfire rimless bottlenecked rifle cartridge announced by SIG Sauer in late 2019. [2] Its hybrid three-piece cartridge case has a steel case head and brass body connected by an aluminum locking washer to support the high chamber pressure ...
The new cartridge is designated as 6.8 × 51 Common, known in the commercial market as the .277 Fury. [31] The bullet size of the 6.8×51mm is virtually identical to the bullet of the 7mm-08 Remington. The difference in diameter is less than 1/128 of an inch (0.2 mm), or approximately the thickness of two human hairs. [32]
The SIG MCX Spear (stylized as MCX-SPEAR) is a multi-caliber rifle developed by the American division of SIG Sauer from the SIG MCX series of carbines. The SIG MCX Spear is primarily chambered in .277 SIG FURY but can be adapted to 7.62×51mm NATO and 6.5mm Creedmoor with a barrel change.
The new 7-mm .277 Fury round will be deployed both in an infantry battle rifle as well as in a dedicated machine gun and exemplifies the requirement of the much higher chamber pressure, 80-90,000 PSI Vs 55-60,000 PSI in the older ammunition required to attain the demanded ballistic performance with a 7-mm bullet in both weapon systems. [6]
The rifle is available in three chamberings: .308 Winchester, 6.5mm Creedmoor, or .277 FURY. [a] Barrel length is either 16-inch (410 mm) for .308 Winchester and .277 FURY chamberings, or 18-inch (460 mm) for the 6.5mm Creedmoor chambering, [3] both of which have a 1:8 barrel twist.
277 Wolverine : Standard military 5.56x45 case (also .223), shoulder is reformed lower, length is trimmed, neck is sized to .277 6.8 SPC (.277) : Proprietary. Developed as an all new cartridge in the hopes of gaining a military contract. Rim diameter is 0.421" 300 AAC Blackout : Uses military 5.56x45 (also .223). The shoulder is reformed ...
.277 FURY: NGSW program: Selected by the United States Army to replace the M16/M4 platform. Sniper rifles, marksman rifles and anti-materiel sniper rifles Mk 14 EBR: Designated marksman rifle/Sniper rifle: Smith Enterprise, Inc. 7.62×51mm NATO: Army, Coast Guard, USSOCOM: M39 EMR: Designated marksman rifle: Sage International 7.62×51mm NATO ...
.277 Fury (XM5 NGSW) Switzerland Yes 2015–present (MCX) 2019–Present (XM7) SIG Sauer SIG516: Schweizerische Industrie Gesellschaft: 5.56×45mm NATO.223 Remington 7.62×39mm United States Yes c. 2010–present SIG Sauer SIGM400: Schweizerische Industrie Gesellschaft: 5.56×45mm NATO.223 Remington.300 AAC Blackout United States Yes 2010-present